用核磁共振测井定量评价稠油储层的方法

A Quantitative Evaluation Method for Heavy-oil Reservoir with NMR Log Data

稠油由于高粘度、高密度特性,使得其T2弛豫很快,造成其信号在T2谱上与束缚水信号重叠在一起很难区分。以往那些利用核磁共振测井资料计算储层参数的方法用于稠油储层参数的计算存在很大误差。因此,通过对大量实验室测量数据分析,建立了原油粘度与T2截止值、T2极大值、视含氢指数、总孔隙度等关系;提出了等面积元、特征区间等定量计算稠油储层参数的新方法;经多井实际应用,效果很好。

Heavy oil has more quick T2 relaxation because of its high viscosity and high density. It is difficult to identify the heavy-oil information and bound water on the T2 spectrum . The traditional method determining reservoir parameters isn＇t valid to evaluate heavy-oil reservoir. So many relationships have been made by analyzing large amount of data obtained from NMR laboratory measurements, such as the viscosity to T2 cutoff, T2 maximum, the apparent hydrogen index （HIa）, total porosity, etc. New methods, including equivalent volume of bound-fluid porosity and characteristic divisions ,are given in this paper to calculate parameters of heavy-oil reservoir . Good results have been obtained from these new methods